JPH08269754A - Production of cold rolled ferritic stainless steel strip - Google Patents

Production of cold rolled ferritic stainless steel strip

Info

Publication number
JPH08269754A
JPH08269754A JP7072102A JP7210295A JPH08269754A JP H08269754 A JPH08269754 A JP H08269754A JP 7072102 A JP7072102 A JP 7072102A JP 7210295 A JP7210295 A JP 7210295A JP H08269754 A JPH08269754 A JP H08269754A
Authority
JP
Japan
Prior art keywords
less
dew point
nitric acid
steel strip
annealing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP7072102A
Other languages
Japanese (ja)
Inventor
Kunio Fukuda
國夫 福田
Yoshikazu Kawabata
良和 河端
Takumi Ugi
工 宇城
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP7072102A priority Critical patent/JPH08269754A/en
Publication of JPH08269754A publication Critical patent/JPH08269754A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To stabilize the productivity of a highly corrosion resistant steels strip by annealing a cold rolled low-carbon ferritic chromium stainless steel sheet in a reducing atmosphere controlled in dew point and mechanically grinding the surface layers thereof under the specified conditions corresponding to the dew point thereof, then subjecting the steel sheet to an electrolytic treatment. CONSTITUTION: The cold rolled stainless steel sheet having a steel compsn. contg., by weight, <=0.02% e, 0.3 to 3.0% Si, <=1.0% Mn, <=0.05% P, <=0.02% S, 10 to 25% Cr, <=0.02% N, <=0.008% O and <=0.5% Al and consisting of the balance Fe and inevitable impurities is annealed in a reducing atmosphere which consists of an inert gas contg. 20vol.% H2 and is kept at the dew point -10 deg.C or below. The surface layers of the thickness satisfying equation I are then mechanically ground according to the dew point of the inert gas. The steel sheet is thereafter subjected to an electrolytic treatment under conditions of a temp. of 38 to 65 deg.C and current density of 1 to 30A/dm<2> in a nitric acid soln. having a liquid compsn. of a nitric acid concn. of 10 to 300g/l and nitric acid concn. of 1 to 30g/l.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、ステンレス冷延鋼帯
(鋼板も含む)の製造方法に係り、とくに安定した脱ス
ケールを可能にするとともに、脱スケール後の耐食性に
優れた特性を有するフェライト系ステンレス冷延鋼帯の
製造方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a stainless cold-rolled steel strip (including a steel sheet), which enables particularly stable descaling and has excellent corrosion resistance after descaling. The present invention relates to a method for manufacturing a cold rolled stainless steel strip.

【0002】[0002]

【従来の技術】一般に、冷間圧延後のステンレス鋼に
は、加工性および耐食性を確保するために焼鈍が施され
る。フェライト系ステンレス鋼の主な焼鈍方法には、強
還元性雰囲気で処理する方法と燃焼雰囲気で処理する方
法とがある。前者の方法は、光輝焼鈍(BA)処理とよ
ばれ、酸化皮膜(スケール)は極めて薄く、ほとんど圧
延のままの光沢が得られる。一方、後者の方法では焼鈍
時に一定の厚さ以上のスケールが生じるため、このまま
では耐食性、成形・加工時のダイス寿命などに悪影響を
及ぼす。このため、燃焼雰囲気で焼鈍を行った場合に
は、焼鈍後、脱スケールのための酸洗処理が施される。
また、近年、普通鋼の連続焼鈍ライン(CAL)のよう
な還元性雰囲気中で、高速通板する焼鈍方法が試みられ
つつある。この場合に、フェライト系ステンレス鋼は酸
化されやすいCrを含むため、普通鋼では酸化されない
雰囲気であっても、表面にテンパーカラー状のスケール
が生成し、焼鈍後、脱スケール処理が必要であった。
2. Description of the Related Art Generally, cold-rolled stainless steel is annealed to ensure workability and corrosion resistance. The main annealing methods of ferritic stainless steel include a method of treating in a strong reducing atmosphere and a method of treating in a combustion atmosphere. The former method is called bright annealing (BA) treatment, and the oxide film (scale) is extremely thin, and almost as-rolled gloss can be obtained. On the other hand, in the latter method, since a scale having a certain thickness or more is generated during annealing, the corrosion resistance and the die life during forming / working are adversely affected if they remain as they are. Therefore, when annealing is performed in a combustion atmosphere, a pickling treatment for descaling is performed after annealing.
Further, in recent years, an annealing method of performing high-speed strip running in a reducing atmosphere such as a continuous annealing line (CAL) for ordinary steel has been attempted. In this case, since the ferritic stainless steel contains Cr, which is easily oxidized, a temper-colored scale is generated on the surface even in an atmosphere that is not oxidized by ordinary steel, and it is necessary to perform descaling treatment after annealing. .

【0003】ところで、焼鈍後に施される脱スケール処
理として、従来は一般に、溶融アルカリ塩に浸漬するソ
ルト処理もしくは中性塩溶液中における電解処理などの
工程の後に、硫酸、硝酸、硝弗酸等の酸溶液に浸漬する
か、電解処理する工程を組み合わせる方法が採用されて
いた。その具体的方法は、例えば、特公昭38-12162号公
報、特開昭59-59900号公報あるいはステンレス鋼便覧
(長谷川正義監修、日刊工業新聞社、1973、P.839 )等
に開示されている。この他に、工程をより単純化した方
法として、硝塩酸溶液中で電解する技術が特開平1-1471
00号公報、特開平4-66699 号公報等に開示されている。
これら方法が鋼種や焼鈍条件に起因するスケール除去の
難易度によって使い分けられているのが現状であった。
しかし、上記のような工程の脱スケール処理を施して
も、スケール層を除去するためには、長時間にわたる処
理が必要であるのみならず、スケール層を除去したあと
の耐食性が十分ではなく、不安定なものであった。
By the way, as a descaling treatment performed after annealing, conventionally, sulfuric acid, nitric acid, nitric hydrofluoric acid, etc. are generally used after a step such as a salt treatment of dipping in a molten alkali salt or an electrolytic treatment in a neutral salt solution. The method of immersing in the acid solution of 1 or combining the steps of electrolytic treatment was adopted. The specific method is disclosed, for example, in Japanese Examined Patent Publication No. 38-12162, Japanese Unexamined Patent Publication No. 59-59900, or Stainless Steel Handbook (edited by Masayoshi Hasegawa, Nikkan Kogyo Shimbun, 1973, P.839). . In addition to this, as a method of further simplifying the process, a technique of electrolyzing in a nitric acid / hydrochloric acid solution is disclosed in JP-A 1-1471.
It is disclosed in Japanese Patent Laid-Open No. 00, Japanese Patent Laid-Open No. 4-66699, and the like.
At present, these methods are properly used depending on the difficulty of scale removal due to steel type and annealing conditions.
However, even if subjected to the descaling process of the above steps, in order to remove the scale layer, not only the treatment for a long time is required, but the corrosion resistance after removing the scale layer is not sufficient, It was unstable.

【0004】[0004]

【発明が解決しようとする課題】このように、上記既知
技術はいずれも、脱スケール工程の生産性が低いことの
ほか、とくに脱スケール後の耐食性が不十分であるいう
問題を抱えていた。本発明の主たる目的は、ステンレス
冷延鋼帯を焼鈍、脱スケールする際の上記従来技術が抱
えている上述した問題点を惹起することのないステンレ
ス冷延鋼帯の製造方法を提供することにある。本発明の
他の目的は、高い生産性と安定した脱スケール能力を有
し、しかも優れた耐食性を備えたステンレス冷延鋼帯の
製造方法を提供することにある。
As described above, all of the above-mentioned known techniques have problems that productivity in the descaling step is low and corrosion resistance after descaling is insufficient. A main object of the present invention is to provide a method for producing a stainless cold-rolled steel strip which does not cause the above-mentioned problems that the above-mentioned conventional techniques have when annealing and descaling the stainless cold-rolled steel strip. is there. Another object of the present invention is to provide a method for producing a stainless cold-rolled steel strip having high productivity, stable descaling ability, and excellent corrosion resistance.

【0005】[0005]

【課題を解決するための手段】さて、発明者らは、上掲
の目的の実現に向けて、まず、焼鈍後、従来の工程で酸
洗した鋼板の表面を観察するとともに、耐食性との関連
について詳細に調査した。その結果、酸洗後の鋼板表面
には目視では確認できない、微量のSi、Al、Ti、
Nb、Mo等の酸化物が地鉄との界面近傍に残存してお
り、これらの元素は鋼中に固溶状態で存在していると耐
食性を向上させるが、酸化物の状態で表面に残存する
と、そこが発錆起点となり、耐食性を劣化させることを
見いだした。また、これらの酸化物は、化学的な処理だ
けでは短時間では溶解除去できず、むしろ他の元素が選
択的に溶解するために表層部に濃化することが分かっ
た。そこで、この部分を機械的に研削して除去すること
により、耐食性の向上がはかられるとともに、安定、高
能率な脱スケールも可能になるという知見を得た。ま
た、耐食性を劣化させる上記Si、Al、Ti、Nb、
Mo等の酸化物は、焼鈍過程で地鉄との界面近傍に濃
化、形成したものであって、酸化物が存在表面から深さ
が焼鈍条件によって異なることをも知見した。
[Means for Solving the Problems] In order to achieve the above-mentioned object, the inventors first observe the surface of a steel sheet pickled in a conventional process after annealing, and show the relationship with the corrosion resistance. Was investigated in detail. As a result, trace amounts of Si, Al, Ti, which cannot be visually confirmed on the surface of the steel sheet after pickling,
Oxides such as Nb and Mo remain near the interface with the base iron, and these elements improve corrosion resistance when they exist in solid solution in steel, but remain on the surface in the state of oxides. Then, it was found that it became the starting point of rusting and deteriorated the corrosion resistance. Further, it was found that these oxides cannot be dissolved and removed in a short time only by chemical treatment, and rather, they are concentrated in the surface layer portion because other elements are selectively dissolved. Therefore, it has been found that mechanically grinding and removing this portion improves the corrosion resistance and enables stable and highly efficient descaling. Further, the above Si, Al, Ti, Nb, which deteriorates corrosion resistance,
It was also found that oxides such as Mo are concentrated and formed in the vicinity of the interface with the base iron during the annealing process, and the depth from the surface where the oxide is present varies depending on the annealing conditions.

【0006】本発明は、上記の知見に基づいて完成され
たものであって、その要旨構成は次のとおりである。 (1) C:0.02wt%以下、 Si:0.3 〜3.0 wt%、M
n:1.0 wt%以下、 P:0.05wt%以下、S:0.02w
t%以下、 Cr:10〜25wt%、N:0.02wt%以下、
O:0.008 wt%以下、Al:0.5 wt%以下を含有
し、残部がFeおよび不可避的不純物からなる鋼組成の冷
延鋼帯を、ガス組成がH2 :20 vol%以下、残部:不
活性ガスからなり、露点が−10℃以下である還元性雰
囲気中で焼鈍し、次いで前記露点に応じて下記式: A>−40℃のとき、 3.0×10-3×A+ 1.3×10-1≦B
≦10 A≦−40℃のとき、 0.01 ≦B≦10 ただし、A:焼鈍雰囲気の露点(℃) B:研削厚み(μm) を満足する厚みの表面層を機械的に研削し、その後液組
成が硝酸濃度:10〜300(g/l) 、塩酸濃度:1〜30(g/l)
、液温が35〜65℃の硝塩酸溶液中において電流密度が
1〜30(A/dm2) の条件で電解処理を行うことを特徴とす
るフェライト系ステンレス冷延鋼帯の製造方法。
The present invention has been completed based on the above findings, and its gist structure is as follows. (1) C: 0.02 wt% or less, Si: 0.3 to 3.0 wt%, M
n: 1.0 wt% or less, P: 0.05 wt% or less, S: 0.02w
t% or less, Cr: 10 to 25 wt%, N: 0.02 wt% or less,
O: 0.008 wt% or less, Al: 0.5 wt% or less, the balance is a cold-rolled steel strip having a steel composition consisting of Fe and unavoidable impurities, the gas composition is H 2 : 20 vol% or less, the balance: inert 3.0 x 10 -3 x A + 1.3 x 10 -1 ≤ when annealed in a reducing atmosphere consisting of gas and having a dew point of -10 ° C or lower, and then according to the above dew point: A> -40 ° C. B
When ≦ 10 A ≦ −40 ° C., 0.01 ≦ B ≦ 10 where A: dew point (° C.) of annealing atmosphere B: mechanically grind a surface layer having a thickness that satisfies the grinding thickness (μm), and then the liquid composition Nitric acid concentration: 10-300 (g / l), hydrochloric acid concentration: 1-30 (g / l)
A method for producing a ferritic stainless cold-rolled steel strip, which comprises performing an electrolytic treatment in a nitric acid / hydrochloric acid solution having a liquid temperature of 35 to 65 ° C and a current density of 1 to 30 (A / dm 2 ).

【0007】(2) 上記(1) に記載の鋼組成のものに、さ
らにTi:0.1 〜1.0 wt%、 Nb:0.1 〜2.0 wt%、M
o:0.3 〜5.0 wt%、 Cu:0.3 〜1.0 wt%、Ni:0.1
〜1.0 wt%、 W:0.1 〜1.0 wt%、Co:0.1 〜2.0
wt%のうちから選ばれる1種または2種以上を含有さ
せてなる成分の冷延鋼帯を、ガス組成がH2 :20 vol
%以下、残部:不活性ガスからなり、露点が−10℃以
下である還元性雰囲気中で焼鈍し、次いで前記露点に応
じて下記式: A>−40℃のとき、 3.0×10-3×A+ 1.3×10-1≦B
≦10 A≦−40℃のとき、 0.01 ≦B≦10 ただし、A:焼鈍雰囲気の露点(℃) B:研削厚み(μm) を満足する厚みの表面層を機械的に研削し、その後液組
成が硝酸濃度:10〜300(g/l) 、塩酸濃度:1〜30(g/l)
、液温が35〜65℃の硝塩酸溶液中において電流密度が
1〜30(A/dm2) の条件で電解処理を行うことを特徴とす
るフェライト系ステンレス冷延鋼帯の製造方法。
(2) In addition to the steel composition described in (1) above, Ti: 0.1 to 1.0 wt%, Nb: 0.1 to 2.0 wt%, M
o: 0.3-5.0 wt%, Cu: 0.3-1.0 wt%, Ni: 0.1
~ 1.0 wt%, W: 0.1 ~ 1.0 wt%, Co: 0.1 ~ 2.0
A cold-rolled steel strip containing one or more selected from wt% has a gas composition of H 2 : 20 vol.
% Or less, balance: made of an inert gas, annealed in a reducing atmosphere having a dew point of -10 ° C or less, and then according to the dew point, the following formula: A> -40 ° C, 3.0 x 10 -3 x A + 1.3 x 10 -1 ≤ B
When ≦ 10 A ≦ −40 ° C., 0.01 ≦ B ≦ 10 where A: dew point (° C.) of annealing atmosphere B: mechanically grind a surface layer having a thickness that satisfies the grinding thickness (μm), and then the liquid composition Nitric acid concentration: 10-300 (g / l), hydrochloric acid concentration: 1-30 (g / l)
A method for producing a ferritic stainless cold-rolled steel strip, which comprises performing an electrolytic treatment in a nitric acid / hydrochloric acid solution having a liquid temperature of 35 to 65 ° C and a current density of 1 to 30 (A / dm 2 ).

【0008】(3) 上記(1) または(2) に記載の鋼組成の
ものに、さらにCa:0.003 〜0.02wt%、 B:0.0005〜
0.01wt%のいずれか1種または2種を含有させてなる成
分の冷延鋼帯を、ガス組成がH2:20 vol%以下、残
部:不活性ガスからなり、露点が−10℃以下である還
元性雰囲気中で焼鈍し、次いで前記露点に応じて下記
式: A>−40℃のとき、 3.0×10-3×A+ 1.3×10-1≦B
≦10 A≦−40℃のとき、 0.01 ≦B≦10 ただし、A:焼鈍雰囲気の露点(℃) B:研削厚み(μm) を満足する厚みの表面層を機械的に研削し、その後液組
成が硝酸濃度:10〜300(g/l) 、塩酸濃度:1〜30(g/l)
、液温が35〜65℃の硝塩酸溶液中において電流密度が
1〜30(A/dm2) の条件で電解処理を行うことを特徴とす
るフェライト系ステンレス冷延鋼帯の製造方法。
(3) In addition to the steel composition described in (1) or (2) above, Ca: 0.003 to 0.02 wt%, B: 0.0005 to
A cold-rolled steel strip containing 0.01 wt% of any one or two of them has a gas composition of H 2 : 20 vol% or less, the balance: an inert gas, and a dew point of -10 ° C or less. Annealed in a reducing atmosphere and then, depending on the dew point, the following formula: When A> -40 ° C, 3.0 x 10 -3 x A + 1.3 x 10 -1 ≤ B
When ≦ 10 A ≦ −40 ° C., 0.01 ≦ B ≦ 10 where A: dew point (° C.) of annealing atmosphere B: mechanically grind a surface layer having a thickness that satisfies the grinding thickness (μm), and then the liquid composition Nitric acid concentration: 10-300 (g / l), hydrochloric acid concentration: 1-30 (g / l)
A method for producing a ferritic stainless cold-rolled steel strip, which comprises performing an electrolytic treatment in a nitric acid / hydrochloric acid solution having a liquid temperature of 35 to 65 ° C and a current density of 1 to 30 (A / dm 2 ).

【0009】[0009]

【作用】まず、本発明にけるフェライト系ステンレス冷
延鋼帯の成分組成を限定した理由について説明する。 C:0.02wt%以下 Cは、Crと炭化物を生成し、これが粒界に析出し耐食
性を劣化させるので、なるべく低い方が望ましいが、製
造性の制約から、0.02wt%以下とする。
First, the reason for limiting the component composition of the ferritic stainless cold-rolled steel strip according to the present invention will be described. C: 0.02 wt% or less C forms carbides and carbides, which precipitates at grain boundaries and deteriorates corrosion resistance. Therefore, it is preferable that the C content be as low as possible, but from the standpoint of manufacturability, it is set to 0.02 wt% or less.

【0010】Si:0.3〜3.0wt% 脱酸剤として添加されるほか、0.3wt%以上添加する
と、耐食性を著しく向上させる元素である。しかし、多
量に添加すると加工性、溶接性、および焼鈍後の脱スケ
ール性を劣化させるので、Siは0.3〜3.0wt%、
好ましくは0.3〜1.5wt%とする。
Si: 0.3 to 3.0 wt% Besides being added as a deoxidizing agent, it is an element that significantly improves the corrosion resistance when added in an amount of 0.3 wt% or more. However, if added in a large amount, workability, weldability, and descaling property after annealing are deteriorated, so Si is 0.3 to 3.0 wt%,
Preferably it is 0.3 to 1.5 wt%.

【0011】Mn:1.0wt%以下 Mnは、鋼中で硫化物を生成し耐食性を劣化させるの
で、できるかぎり低い方が望ましいが、製造性の制約か
ら、1.0wt%以下、好ましくは0.5wt%以下とす
る。
Mn: 1.0 wt% or less Mn forms sulfides in steel and deteriorates corrosion resistance. Therefore, it is desirable that Mn be as low as possible, but from the viewpoint of manufacturability, it is 1.0 wt% or less, preferably 0%. 0.5 wt% or less.

【0012】P:0.05wt%以下 Pは、熱間加工性を低下させるので、できるかぎり低い
方が望ましい元素であり、0.05wt%以下、好ましく
は0.03wt%以下とする。
P: 0.05 wt% or less P reduces the hot workability, so that the element whose content is as low as possible is desirable, and is 0.05 wt% or less, preferably 0.03 wt% or less.

【0013】S:0.02wt%以下 Sは、Mnと硫化物を生成し、耐食性を劣化させ、また
熱間加工性を劣化させるので、なるべく低い方が望まし
く、0.02wt%以下、好ましくは0.01wt%以下と
する。
S: 0.02 wt% or less S forms Mn and sulfides, deteriorates corrosion resistance, and deteriorates hot workability. Therefore, S is preferably as low as possible, preferably 0.02 wt% or less, and more preferably 0.02 wt% or less. 0.01 wt% or less.

【0014】Cr:10〜20wt%以下 Crは、ステンレス鋼の耐食性を確保するうえで必要な
基本元素である。強固な不動態皮膜を生成させるために
は10wt%以上の添加が必要であるが、添加量25wt%
を超えてもその効果が飽和し、製造性の制約もあるの
で、10〜25wt%の範囲とする。
Cr: 10 to 20 wt% or less Cr is a basic element necessary for ensuring the corrosion resistance of stainless steel. It is necessary to add 10 wt% or more to form a strong passive film, but the addition amount is 25 wt%
Even if it exceeds the range, the effect is saturated and there is a limitation on the manufacturability, so the range is 10 to 25 wt%.

【0015】N:0.02wt%以下 Nは、Crと反応し、窒化物として粒界に析出し、耐食
性を劣化させるのでなるべく低い方が望ましく、0.0
2wt%以下、好ましくは0.1wt%以下とする。
N: 0.02 wt% or less N reacts with Cr and precipitates at the grain boundaries as a nitride to deteriorate the corrosion resistance, so N is preferably as low as possible.
It is 2 wt% or less, preferably 0.1 wt% or less.

【0016】O:0.008wt%以下 Oは、凝固時に非金属介在物として鋼中に残留し、耐食
性を劣化させるので、なるべく低い方が望ましい。とく
に0.008wt%を超えるとその悪影響が顕著になるの
で、0.008wt%以下、好ましくは0.005wt%以
下とする。
O: 0.008 wt% or less O remains as non-metallic inclusions in the steel during solidification and deteriorates the corrosion resistance. Particularly, when it exceeds 0.008 wt%, its adverse effect becomes remarkable, so 0.008 wt% or less, preferably 0.005 wt% or less.

【0017】Al:0.5wt%以下 Alは、脱酸材として添加されるが、多量に添加すると
加工性を劣化させるため、0.5wt%以下とする。
Al: 0.5 wt% or less Al is added as a deoxidizing agent, but if it is added in a large amount, the workability is deteriorated, so Al is made 0.5 wt% or less.

【0018】また、上記の各成分以外に、下記の成分を
必要に応じて添加することができる。 Ti:0.1〜1.0wt% Tiは、鋼中に残留したC、Nを固定し、粒界侵食を防
止するのに効果的な元素であり、その効果は0.1wt%
以上で現れる。しかし、多量にに添加すると熱間加工性
を劣化させるので、0.1〜1.0wt%とする。なお、
好ましくはC、N量の約8倍以上添加すると効果的であ
る。
In addition to the above components, the following components can be added as required. Ti: 0.1 to 1.0 wt% Ti is an element effective for fixing C and N remaining in steel and preventing grain boundary erosion, and its effect is 0.1 wt%.
Appears above. However, if added in a large amount, the hot workability is deteriorated, so the content is made 0.1 to 1.0 wt%. In addition,
It is effective to add preferably about 8 or more times the amount of C and N.

【0019】Nb:0.1〜2.0wt% Nbは、Tiと同様に、鋼中に残留したC、Nを固定
し、粒界侵食を防止するのに効果的な元素であり、その
効果は0.1wt%以上で現れる。しかし、多量にに添加
すると熱間加工性を劣化させるので、0.1〜2.0wt
%とする。なお、好ましくはC、N量の約8倍以上添加
すると効果的である。
Nb: 0.1 to 2.0 wt% Like Ti, Nb is an element effective for fixing C and N remaining in steel and preventing grain boundary erosion, and its effect. Appears above 0.1 wt%. However, if added in a large amount, the hot workability deteriorates.
%. In addition, it is effective to add about 8 times or more the amount of C and N.

【0020】Mo:0.3〜5.0wt% Moは、ステンレス鋼の耐食性を向上させるのに有効な
成分であり、0.3wt%以上添加すると効果的である
が、多量に添加すると、加工性および溶接部の靱性を低
下させるので5.0wt%とする。なお、好ましい範囲は
0.5〜3.0wt%である。
Mo: 0.3 to 5.0 wt% Mo is an effective component for improving the corrosion resistance of stainless steel, and it is effective to add 0.3 wt% or more, but if added in a large amount, it is processed. Property and toughness of the welded portion are reduced, so it is set to 5.0 wt%. The preferable range is 0.5 to 3.0 wt%.

【0021】Cu:0.3〜1.0wt% Cuは、耐孔食性を向上させる元素であるが、多量に添
加するとマルテンサイトが生じ、耐食性を劣化させるの
で、0.3〜1.0wt%の範囲で添加する。
Cu: 0.3 to 1.0 wt% Cu is an element that improves pitting corrosion resistance, but if added in a large amount, martensite occurs and corrosion resistance deteriorates, so 0.3 to 1.0 wt% Add in the range of.

【0022】Ni:0.1〜1.0wt% Niは、耐食性を向上させる元素であるが、多量に添加
するとマルテンサイトが生じ、耐食性を劣化させるの
で、0.1〜1.0wt%の範囲で添加する。
Ni: 0.1 to 1.0 wt% Ni is an element that improves the corrosion resistance. However, if added in a large amount, martensite occurs, which deteriorates the corrosion resistance. Add in.

【0023】W:0.1〜1.0wt% Wは、耐食性を向上させる元素であるが、多量に添加す
るとかえって耐食性を劣化させるので、0.1〜1.0
wt%の範囲で添加する。
W: 0.1 to 1.0 wt% W is an element that improves the corrosion resistance, but if added in a large amount, it deteriorates the corrosion resistance, so 0.1 to 1.0% by weight.
Add in the range of wt%.

【0024】Co:0.1〜2.0wt% Coは、耐食性を向上させる元素であるが、多量に添加
するとマルテンサイトが生じ、耐食性を劣化させるの
で、0.1〜2.0wt%の範囲で添加する。
Co: 0.1 to 2.0 wt% Co is an element that improves the corrosion resistance, but if added in a large amount, martensite is generated and deteriorates the corrosion resistance. Add in.

【0025】Ca:0.003〜0.02wt% Caは、熱間加工性を向上させる元素であるが、多量に
添加すると、逆に熱間加工性を劣化させるので、0.0
03〜0.02wt%、好ましくは0.005〜0.01
5wt%以下とする。
Ca: 0.003 to 0.02 wt% Ca is an element that improves the hot workability, but if it is added in a large amount, the hot workability deteriorates.
03-0.02 wt%, preferably 0.005-0.01
5 wt% or less.

【0026】B:0.0005〜0.01wt% Bは、熱間加工性および強度を向上させる元素である
が、多量に添加すると、溶接性、熱間加工性を劣化させ
るので、0.0005〜0.01wt%、好ましくは0.
001〜0.005wt%以下とする。
B: 0.0005-0.01 wt% B is an element that improves hot workability and strength, but if added in a large amount, it deteriorates weldability and hot workability, so 0.0005 ~ 0.01 wt%, preferably 0.
001 to 0.005 wt% or less.

【0027】次に、本発明において、焼鈍・脱スケール
条件を限定した理由について説明する。本発明の焼鈍雰
囲気は、還元性雰囲気とする必要がある。連続焼鈍ライ
ン(CAL)などで焼鈍したステンレス鋼帯の表面に生
成するスケールの厚みや、地鉄とスケールとの界面にお
ける各元素の濃化の度合は、焼鈍雰囲気の組成や露点に
より大きい影響を受ける。すなわち、還元性雰囲気の露
点が−10℃より高くなると、生成スケールが厚くな
り、また地鉄とスケールとの界面でのSi,Al,T
i,Nb,Moといった脱スケール性および酸洗後の耐
食性を劣化させる元素の濃化の度合が大きくなる。その
ため、スケールが厚くなり過ぎたり、地鉄にこれらの元
素の濃化度合が過大になると、後の工程でメカニカルな
研削を行っても、高速短時間で脱スケール処理すること
が困難となる。また、焼鈍雰囲気中のH2濃度が高けれ
ば、スケールおよび濃化層は薄くなるが、20 vol%付
近で飽和する。なお、過度にH2濃度が高くなると安全性
およびコストの点から不利となる。よって、焼鈍雰囲気
の条件は、H2:20 vol%以下、露点:−10℃以下、
好ましくはH2:2〜10 vol%、露点:−25〜−45
℃とする。
Next, the reason for limiting the annealing / descaling conditions in the present invention will be described. The annealing atmosphere of the present invention needs to be a reducing atmosphere. The thickness of the scale formed on the surface of the stainless steel strip annealed by the continuous annealing line (CAL) and the degree of concentration of each element at the interface between the base steel and the scale have a greater influence on the composition of the annealing atmosphere and the dew point. receive. That is, when the dew point of the reducing atmosphere is higher than −10 ° C., the produced scale becomes thicker, and Si, Al, T at the interface between the base steel and the scale are thickened.
The degree of concentration of elements such as i, Nb, and Mo that deteriorate descaling and corrosion resistance after pickling increases. Therefore, if the scale becomes too thick or the base iron has an excessively high concentration of these elements, it becomes difficult to perform descaling at high speed and in a short time even if mechanical grinding is performed in a subsequent step. Further, if the H 2 concentration in the annealing atmosphere is high, the scale and the concentrated layer become thin, but they are saturated at around 20 vol%. In addition, if the H 2 concentration is excessively high, it is disadvantageous in terms of safety and cost. Therefore, the conditions of the annealing atmosphere are H 2 : 20 vol% or less, dew point: −10 ° C. or less,
Preferably H 2: 2~10 vol%, dew point: -25-45
℃.

【0028】上記焼鈍に引き続き機械的な研削を行う。
本発明における機械的な研削とは、ブラシロール、研磨
粉、ショットブラストなどを用いる機械的な研削処理の
ことを意味する。発明者等は、前述したように、従来の
工程で酸洗後の鋼板表面を詳細に調査した結果、Si,
Al,Ti,Nb,Mo等の酸化物が表面に残存し、ま
た地鉄表層部にこれらの元素が濃化しており、これらが
脱スケール性および耐食性を劣化させていることをつき
とめた。そこで、鋼帯表面から所定の厚みだけ機械的に
研削除去することにより、焼鈍後の鋼帯の表面状態を一
定に維持することができ、脱スケールの安定と耐食性の
向上を図ることが可能となる。さらに、この機械的な研
削により、焼鈍時に濃化した地鉄界面のSi,Al,T
i,Nb,Mo等の、後工程の硝塩酸溶液中で難溶性
で、鋼板の耐食性を劣化させる部分を除去できる。これ
らの作用によって、従来に比べて高速短時間に脱スケー
ル処理をお行うことができ、酸洗後の鋼板の耐食性も向
上する。
Following the above-mentioned annealing, mechanical grinding is performed.
The mechanical grinding in the present invention means a mechanical grinding process using a brush roll, polishing powder, shot blast, or the like. As described above, the inventors have conducted a detailed examination of the surface of the steel sheet after pickling in the conventional process and found that Si,
It was found that oxides of Al, Ti, Nb, Mo, etc. remained on the surface and these elements were concentrated on the surface layer of the base metal, which deteriorated the descaling property and the corrosion resistance. Therefore, by mechanically grinding and removing a predetermined thickness from the surface of the steel strip, the surface condition of the steel strip after annealing can be maintained constant, and it is possible to stabilize descaling and improve corrosion resistance. Become. Furthermore, by this mechanical grinding, Si, Al, and T at the interface of the base iron concentrated during annealing
Parts of i, Nb, Mo, etc. that are poorly soluble in the nitric acid hydrochloric acid solution in the subsequent step and deteriorate the corrosion resistance of the steel sheet can be removed. By these actions, descaling can be performed at a higher speed and in a shorter time than in the conventional case, and the corrosion resistance of the steel sheet after pickling is also improved.

【0029】本発明における機械的な研削量(厚み)は
次式で示される範囲で行えばよい。 A>−40℃のとき、 3.0×10-3×A+ 1.3×10-1≦B
≦10 A≦−40℃のとき、 0.01 ≦B≦10 ただし、A:焼鈍雰囲気の露点(℃) B:研削厚み(μm) 研削量を上式のように、焼鈍雰囲気の露点に依存して定
めたのは、次の理由による。すなわち、発明者等は、ス
ケール厚、地鉄のSi,Al,Ti,Nb,Mo等各元
素の濃化層に及ぼす焼鈍条件の影響を調査した結果、通
常の操業に適用される焼鈍温度1050℃以下では、スケー
ル厚みおよび濃化層厚みは焼鈍雰囲気の露点に大きく依
存しており、この濃化層の表面からの厚みは、還元性雰
囲気中では、露点−40℃以上の範囲では、ほぼ露点に比
例し、−40℃以下では露点に関係なく、ほぼ一定の厚み
になることを見いだした。この事実の基づき上記式の下
限を定めた。研削量がこの範囲より少なくなると、スケ
ールまたは上記各元素の濃化層が残り、脱スケール性が
劣化し、安定した脱スケールを行うことができなくな
り、酸洗後にもこれらの元素が残り、耐食性を劣化させ
る。一方、研削量が10μm を超えると、表面が荒れ、研
削時に火花発生等の問題も生じるので、研削量の上限は
10μm とする。
The mechanical grinding amount (thickness) in the present invention may be performed within the range shown by the following equation. When A> -40 ° C, 3.0 x 10 -3 x A + 1.3 x 10 -1 ≤ B
When ≦ 10 A ≦ −40 ° C., 0.01 ≦ B ≦ 10 where A: dew point of annealing atmosphere (° C.) B: grinding thickness (μm) The amount of grinding depends on the dew point of the annealing atmosphere as shown in the above formula. The reason is as follows. That is, the inventors investigated the influence of annealing conditions on the scale thickness and the concentrated layer of each element such as Si, Al, Ti, Nb, and Mo of the base iron, and as a result, the annealing temperature applied to the normal operation was 1,050. At ℃ or less, the scale thickness and the concentrated layer thickness largely depends on the dew point of the annealing atmosphere, the thickness from the surface of this concentrated layer, in the reducing atmosphere, in the range of dew point -40 ℃ or more, almost It has been found that the thickness is proportional to the dew point, and that at -40 ° C or lower, the thickness is almost constant regardless of the dew point. Based on this fact, the lower limit of the above equation was set. If the grinding amount is less than this range, the scale or concentrated layer of each of the above elements remains, descaling property deteriorates, stable descaling cannot be performed, these elements remain even after pickling, and corrosion resistance Deteriorate. On the other hand, if the grinding amount exceeds 10 μm, the surface becomes rough and sparks may occur during grinding.
10 μm.

【0030】上記の機械的研削の後、硝塩酸溶液中で酸
洗を行う。発明者らは、研削後の処理液について、機
械的研削傷の除去性、表面の平滑性確保不動態化処
理の短時間処理、の観点から様々な溶液中で研削後の鋼
板を処理した結果、硝塩酸溶液中で処理する方法が適し
ていることを見い出した。そして、硝塩酸溶液中の処理
としては、硝酸10〜300(g/l)と塩酸1〜30(g/l)との混
合液中で、温度35℃〜65℃、電流密度1〜30(A/dm2) の
条件で電解処理を行うことが必要である。
After the above mechanical grinding, pickling is performed in a nitric acid / hydrochloric acid solution. The inventors treated the steel plate after grinding in various solutions from the viewpoints of the processing liquid after grinding, from the viewpoints of the mechanical grinding scratch removability, the surface smoothness ensuring passivation treatment for a short time, and the like. , It was found that the method of treating in a nitric acid hydrochloric acid solution is suitable. And, as the treatment in the nitric acid / hydrochloric acid solution, in a mixed solution of nitric acid 10 to 300 (g / l) and hydrochloric acid 1 to 30 (g / l), a temperature of 35 ° C. to 65 ° C. and a current density of 1 to 30 ( It is necessary to perform electrolytic treatment under the condition of A / dm 2 ).

【0031】硝酸濃度が10 g/lに満たないと、短時間に
不動態化処理することが難しく、一方300g/lを超えると
NOX 発生量が増大するという弊害がおこる。また、塩
酸濃度が1g/lに満たないと高速に脱スケールすることが
難しく、30 g/lを超えると肌荒れが起こる。以上の理由
から、硝塩酸の処理液は、硝酸10〜300(g/l)と塩酸1〜
30(g/l) との混合液、好ましくは、硝酸50〜200(g/l)と
塩酸3 〜20(g/l) との混合液とする。
If the nitric acid concentration is less than 10 g / l, it is difficult to perform the passivation treatment in a short time. On the other hand, if the nitric acid concentration exceeds 300 g / l, the amount of NO x produced increases. If the concentration of hydrochloric acid is less than 1 g / l, it is difficult to descale at high speed, and if it exceeds 30 g / l, rough skin occurs. For the above reasons, the nitric acid-hydrochloric acid treatment solution is composed of nitric acid 10-300 (g / l) and hydrochloric acid 1-
A mixed solution with 30 (g / l), preferably 50-200 (g / l) nitric acid and 3-20 (g / l) hydrochloric acid is used.

【0032】また硝塩酸溶液の温度については、温度が
35℃に満たないと、短時間に処理することが困難とな
り、65℃を超えるとNOX 発生量の増大や肌荒れ等の弊
害を生じる。以上の理由から、硝塩酸の処理液の温度は
35〜65℃、好ましくは40〜60℃がよい。
Regarding the temperature of the nitric acid / hydrochloric acid solution, the temperature is
If less than 35 ° C., it becomes difficult to process a short time, resulting in adverse effects increase and rough skin like of the NO X generation amount exceeds 65 ° C.. For the above reasons, the temperature of the treatment solution of nitric acid hydrochloric acid is
The temperature is 35 to 65 ° C, preferably 40 to 60 ° C.

【0033】さらに、硝塩酸溶液中での電解電流密度
は、1A/dm2 に満たないと短時間で処理できず、一方30
A/dm2 を超えるとNOX 発生量が増大や肌荒れ等の弊害
を生ずる。以上の理由から、電流密度は1〜30(A/dm2)
、好ましくは5〜25 A/dm2とする。なお、以上の各条
件による脱スケール処理に必要な時間は3〜10sec の範
囲で行うのが好ましい。
Further, if the electrolytic current density in the nitric acid / hydrochloric acid solution is less than 1 A / dm 2 , the treatment cannot be carried out in a short time.
If it exceeds A / dm 2 , the amount of NO x generated increases and the skin becomes rough. For the above reasons, the current density is 1 to 30 (A / dm 2 ).
And preferably 5 to 25 A / dm 2 . The time required for the descaling treatment under the above conditions is preferably within the range of 3 to 10 seconds.

【0034】[0034]

【実施例】実施例1 表1、表2に示す成分組成のステンレス鋼を溶製し、熱
間圧延、焼鈍、酸洗の後冷間圧延し、板厚1.0 mmの冷延
鋼帯を得た。この供試材を表2に示す各条件で、焼鈍、
研削および酸洗を行い、耐食性について調べた。ここ
で、焼鈍パターンは、約200 sec 秒で900 ℃まで昇温
し、900 ℃×60 sec保持の後空冷とした。研削は、ナイ
ロン製のブラシを用いる方法により行った。また、比較
のために、成分組成が本発明範囲をはずれた供試材も用
いた。耐食性の判定は、孔食電位(JIS G 0577)および
CASS試験(JIS D 0201)により評価した。その結果
を表3、表4に併せて示す。
Example 1 Stainless steels having the compositions shown in Table 1 and Table 2 were melted, hot-rolled, annealed, pickled and then cold-rolled to obtain a cold-rolled steel strip having a plate thickness of 1.0 mm. It was The test material was annealed under the conditions shown in Table 2,
After grinding and pickling, the corrosion resistance was examined. Here, the annealing pattern was heated to 900 ° C. in about 200 sec, held at 900 ° C. × 60 sec, and then air-cooled. Grinding was performed by a method using a nylon brush. Further, for comparison, a test material having a component composition outside the range of the present invention was also used. The judgment of corrosion resistance was evaluated by pitting potential (JIS G 0577) and CASS test (JIS D 0201). The results are also shown in Tables 3 and 4.

【0035】[0035]

【表1】 [Table 1]

【0036】[0036]

【表2】 [Table 2]

【0037】[0037]

【表3】 [Table 3]

【0038】[0038]

【表4】 [Table 4]

【0039】表2から、本発明の方法によれば、酸洗時
間が4秒以内という短時間に行え、酸洗後の耐食性が極
めて良好であることがわかった。これは、成分が適正範
囲にあることに加えて、濃化層の除去を含め、脱スケー
ルが安定して行われた結果である。これに対し、本発明
の範囲を外れた比較例では、酸洗後の耐食性が劣ってい
ることが示された。
From Table 2, it was found that according to the method of the present invention, the pickling time can be as short as 4 seconds or less, and the corrosion resistance after pickling is extremely good. This is a result of stable descaling including removal of the concentrated layer in addition to the components being in the proper range. On the other hand, in Comparative Examples outside the scope of the present invention, it was shown that the corrosion resistance after pickling was inferior.

【0040】実施例2 表5、表6に示す成分組成のステンレス鋼を溶製し、熱
間圧延、焼鈍、酸洗の後冷間圧延し、板厚1.0 mmの冷延
鋼帯を得た。この供試材を表2に示す各条件で、焼鈍、
研削および酸洗を行い、耐食性について調べた。ここ
で、焼鈍パターンは、約200 sec 秒で900 ℃まで昇温
し、900 ℃×60 sec保持の後空冷とした。研削は、ナイ
ロン製のブラシを用いる方法により行った。また、比較
のために、焼鈍・脱スケール条件が本発明範囲をはずれ
たものについても実験した。耐食性の判定は、孔食電位
(JIS G 0577)およびCASS試験(JIS D 0201)によ
り評価した。その結果を表7、表8に併せて示す。
Example 2 Stainless steels having the compositions shown in Tables 5 and 6 were melted, hot-rolled, annealed, pickled and then cold-rolled to obtain a cold-rolled steel strip having a plate thickness of 1.0 mm. . The test material was annealed under the conditions shown in Table 2,
After grinding and pickling, the corrosion resistance was examined. Here, the annealing pattern was heated to 900 ° C. in about 200 sec, held at 900 ° C. × 60 sec, and then air-cooled. Grinding was performed by a method using a nylon brush. Further, for comparison, an experiment was carried out for annealing / descaling conditions outside the scope of the present invention. The judgment of corrosion resistance was evaluated by pitting potential (JIS G 0577) and CASS test (JIS D 0201). The results are also shown in Tables 7 and 8.

【0041】[0041]

【表5】 [Table 5]

【0042】[0042]

【表6】 [Table 6]

【0043】[0043]

【表7】 [Table 7]

【0044】[0044]

【表8】 [Table 8]

【0045】表4から、本発明の方法によれば、酸洗時
間が5秒以内という短時間に行え、酸洗後の耐食性が極
めて良好であることがわかった。これは、濃化層の除去
を含め、脱スケールが安定して行われた結果である。こ
れに対し、本発明の範囲を外れた比較例では、酸洗後の
耐食性が劣っていることが明瞭に示された。以上の実験
から、フェライト系ステンレス冷延鋼帯の耐食性は、鋼
組成、焼鈍条件、機械的な切削条件および酸洗条件がす
べて本発明範囲を満たしたときに始めて優れた特性を示
すことが明らかである。
From Table 4, it was found that according to the method of the present invention, the pickling time could be as short as 5 seconds or less, and the corrosion resistance after pickling was extremely good. This is a result of stable descaling including removal of the concentrated layer. On the other hand, in Comparative Examples outside the scope of the present invention, it was clearly shown that the corrosion resistance after pickling was inferior. From the above experiments, it is clear that the corrosion resistance of the ferritic stainless cold rolled steel strip shows excellent properties only when the steel composition, annealing conditions, mechanical cutting conditions and pickling conditions all satisfy the scope of the present invention. Is.

【0046】[0046]

【発明の効果】上述したように、本発明方法によれば、
高能率で安定した脱スケールが可能となり、脱スケール
後の耐食性を著しく改善することが可能となる。このた
め、本発明方法によれば、耐食性向上元素の添加量が従
来より節減できるとともに、優れた品質のフェライト系
ステンレス鋼帯を低コストで製造することが可能とな
る。
As described above, according to the method of the present invention,
It enables highly efficient and stable descaling, and can significantly improve the corrosion resistance after descaling. Therefore, according to the method of the present invention, the addition amount of the corrosion resistance improving element can be reduced as compared with the conventional method, and a ferritic stainless steel strip of excellent quality can be manufactured at low cost.

フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 C22C 38/52 C22C 38/52 38/60 38/60 C25F 1/06 C25F 1/06 B Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI Technical display area C22C 38/52 C22C 38/52 38/60 38/60 C25F 1/06 C25F 1/06 B

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】C:0.02wt%以下、 Si:0.3 〜3.0
wt%、 Mn:1.0 wt%以下、 P:0.05wt%以下、 S:0.02wt%以下、 Cr:10〜25wt%、 N:0.02wt%以下、 O:0.008 wt%以下、 Al:0.5 wt%以下を含有し、残部がFeおよび不可避的不
純物からなる鋼組成の冷延鋼帯を、ガス組成がH2 :2
0 vol%以下、残部:不活性ガスからなり、露点が−1
0℃以下である還元性雰囲気中で焼鈍し、次いで前記露
点に応じて下記式: A>−40℃のとき、 3.0×10-3×A+ 1.3×10-1≦B
≦10 A≦−40℃のとき、 0.01 ≦B≦10 ただし、A:焼鈍雰囲気の露点(℃) B:研削厚み(μm) を満足する厚みの表面層を機械的に研削し、その後液組
成が硝酸濃度:10〜300(g/l) 、塩酸濃度:1〜30(g/l)
、液温が35〜65℃の硝塩酸溶液中において電流密度が
1〜30(A/dm2) の条件で電解処理を行うことを特徴とす
るフェライト系ステンレス冷延鋼帯の製造方法。
1. C: 0.02 wt% or less, Si: 0.3 to 3.0
wt%, Mn: 1.0 wt% or less, P: 0.05 wt% or less, S: 0.02 wt% or less, Cr: 10 to 25 wt%, N: 0.02 wt% or less, O: 0.008 wt% or less, Al: 0.5 wt% A cold-rolled steel strip containing the following, with the balance being Fe and unavoidable impurities, and having a gas composition of H 2 : 2
0 vol% or less, balance: consisting of inert gas, dew point -1
Annealing in a reducing atmosphere at 0 ° C. or lower, and then the following formula according to the dew point: A> −40 ° C., 3.0 × 10 −3 × A + 1.3 × 10 −1 ≦ B
When ≦ 10 A ≦ −40 ° C., 0.01 ≦ B ≦ 10 where A: dew point (° C.) of annealing atmosphere B: mechanically grind a surface layer having a thickness that satisfies the grinding thickness (μm), and then the liquid composition Nitric acid concentration: 10-300 (g / l), hydrochloric acid concentration: 1-30 (g / l)
A method for producing a ferritic stainless cold-rolled steel strip, which comprises performing an electrolytic treatment in a nitric acid / hydrochloric acid solution having a liquid temperature of 35 to 65 ° C and a current density of 1 to 30 (A / dm 2 ).
【請求項2】請求項1に記載の鋼組成のものに、さらに
Ti:0.1 〜1.0 wt%、 Nb:0.1 〜2.0 wt%、 Mo:0.3 〜5.0 wt%、 Cu:0.3 〜1.0 wt%、 Ni:0.1 〜1.0 wt%、 W:0.1 〜1.0 wt%、 Co:0.1 〜2.0 wt%のうちから選ばれる1種または2種
以上を含有させてなる成分の冷延鋼帯を、ガス組成がH
2 :20 vol%以下、残部:不活性ガスからなり、露点
が−10℃以下である還元性雰囲気中で焼鈍し、次いで
前記露点に応じて下記式: A>−40℃のとき、 3.0×10-3×A+ 1.3×10-1≦B
≦10 A≦−40℃のとき、 0.01 ≦B≦10 ただし、A:焼鈍雰囲気の露点(℃) B:研削厚み(μm) を満足する厚みの表面層を機械的に研削し、その後液組
成が硝酸濃度:10〜300(g/l) 、塩酸濃度:1〜30(g/l)
、液温が35〜65℃の硝塩酸溶液中において電流密度が
1〜30(A/dm2) の条件で電解処理を行うことを特徴とす
るフェライト系ステンレス冷延鋼帯の製造方法。
2. The steel composition according to claim 1, further comprising:
Ti: 0.1-1.0 wt%, Nb: 0.1-2.0 wt%, Mo: 0.3-5.0 wt%, Cu: 0.3-1.0 wt%, Ni: 0.1-1.0 wt%, W: 0.1-1.0 wt%, Co: A cold rolled steel strip containing one or more selected from 0.1 to 2.0 wt% has a gas composition of H
2 : 20 vol% or less, balance: made of inert gas, annealed in a reducing atmosphere having a dew point of -10 ° C or less, and then, according to the dew point, the following formula: A> -40 ° C, 3.0 × 10 -3 x A + 1.3 x 10 -1 ≤ B
When ≦ 10 A ≦ −40 ° C., 0.01 ≦ B ≦ 10 where A: dew point (° C.) of annealing atmosphere B: mechanically grind a surface layer having a thickness that satisfies the grinding thickness (μm), and then the liquid composition Nitric acid concentration: 10-300 (g / l), hydrochloric acid concentration: 1-30 (g / l)
A method for producing a ferritic stainless cold-rolled steel strip, which comprises performing an electrolytic treatment in a nitric acid / hydrochloric acid solution having a liquid temperature of 35 to 65 ° C and a current density of 1 to 30 (A / dm 2 ).
【請求項3】請求項1または請求項2に記載の鋼組成の
ものに、さらにCa:0.003 〜0.02wt%、 B:0.0005〜
0.01wt%のいずれか1種または2種を含有させてなる成
分の冷延鋼帯を、ガス組成がH2:20 vol%以下、残
部:不活性ガスからなり、露点が−10℃以下である還
元性雰囲気中で焼鈍し、次いで前記露点に応じて下記
式: A>−40℃のとき、 3.0×10-3×A+ 1.3×10-1≦B
≦10 A≦−40℃のとき、 0.01 ≦B≦10 ただし、A:焼鈍雰囲気の露点(℃) B:研削厚み(μm) を満足する厚みの表面層を機械的に研削し、その後液組
成が硝酸濃度:10〜300(g/l) 、塩酸濃度:1〜30(g/l)
、液温が35〜65℃の硝塩酸溶液中において電流密度が
1〜30(A/dm2) の条件で電解処理を行うことを特徴とす
るフェライト系ステンレス冷延鋼帯の製造方法。
3. The steel composition according to claim 1 or 2, further comprising Ca: 0.003 to 0.02 wt% and B: 0.0005 to.
A cold-rolled steel strip containing 0.01 wt% of any one or two of them has a gas composition of H 2 : 20 vol% or less, the balance: an inert gas, and a dew point of -10 ° C or less. Annealed in a reducing atmosphere and then, depending on the dew point, the following formula: When A> -40 ° C, 3.0 x 10 -3 x A + 1.3 x 10 -1 ≤ B
When ≦ 10 A ≦ −40 ° C., 0.01 ≦ B ≦ 10 where A: dew point (° C.) of annealing atmosphere B: mechanically grind a surface layer having a thickness that satisfies the grinding thickness (μm), and then the liquid composition Nitric acid concentration: 10-300 (g / l), hydrochloric acid concentration: 1-30 (g / l)
A method for producing a ferritic stainless cold-rolled steel strip, which comprises performing an electrolytic treatment in a nitric acid / hydrochloric acid solution having a liquid temperature of 35 to 65 ° C and a current density of 1 to 30 (A / dm 2 ).
JP7072102A 1995-03-29 1995-03-29 Production of cold rolled ferritic stainless steel strip Pending JPH08269754A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7072102A JPH08269754A (en) 1995-03-29 1995-03-29 Production of cold rolled ferritic stainless steel strip

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7072102A JPH08269754A (en) 1995-03-29 1995-03-29 Production of cold rolled ferritic stainless steel strip

Publications (1)

Publication Number Publication Date
JPH08269754A true JPH08269754A (en) 1996-10-15

Family

ID=13479713

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7072102A Pending JPH08269754A (en) 1995-03-29 1995-03-29 Production of cold rolled ferritic stainless steel strip

Country Status (1)

Country Link
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005024098A3 (en) * 2003-09-03 2005-08-25 Ati Properties Inc Oxidation resistant ferritic stainless steels
JP2007284771A (en) * 2006-04-20 2007-11-01 Nippon Steel & Sumikin Stainless Steel Corp Cr-containing steel sheet having excellent shape-fixability and production method therefor
JP2008190009A (en) * 2007-02-06 2008-08-21 Nippon Steel Corp Manufacturing method of hot-rolled ferritic stainless steel strip having excellent sulfuric-acid pickling property
US7914630B2 (en) * 2004-03-25 2011-03-29 Ugine & Alz France Method for producing mat-surfaced austenitic stainless steel strips
JP2020063499A (en) * 2018-10-19 2020-04-23 日鉄ステンレス株式会社 Stainless steel
JP2021091938A (en) * 2019-12-11 2021-06-17 Jfeスチール株式会社 Ferritic stainless steel sheet for civil engineering, manufacturing method thereof, and civil engineering structures using the steel sheet

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005024098A3 (en) * 2003-09-03 2005-08-25 Ati Properties Inc Oxidation resistant ferritic stainless steels
US7914630B2 (en) * 2004-03-25 2011-03-29 Ugine & Alz France Method for producing mat-surfaced austenitic stainless steel strips
JP2007284771A (en) * 2006-04-20 2007-11-01 Nippon Steel & Sumikin Stainless Steel Corp Cr-containing steel sheet having excellent shape-fixability and production method therefor
JP4740021B2 (en) * 2006-04-20 2011-08-03 新日鐵住金ステンレス株式会社 Cr-containing thin steel sheet having excellent shape freezing property and method for producing the same
JP2008190009A (en) * 2007-02-06 2008-08-21 Nippon Steel Corp Manufacturing method of hot-rolled ferritic stainless steel strip having excellent sulfuric-acid pickling property
JP2020063499A (en) * 2018-10-19 2020-04-23 日鉄ステンレス株式会社 Stainless steel
JP2021091938A (en) * 2019-12-11 2021-06-17 Jfeスチール株式会社 Ferritic stainless steel sheet for civil engineering, manufacturing method thereof, and civil engineering structures using the steel sheet

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